When someone makes a transport instrument, they must make sure they have talked to everyone they think should be involved. They need to think about what the instrument is about and who should have a say. You can think of it like making a plan that affects a lot of people, so they should be asked what they think.

If the transport instrument is just a small change to an existing one, and it's not a big deal, then they don't need to ask everyone again. This is because the change is minor or just technical, so it's not a big change. You can think of it like fixing a small mistake in a plan, rather than making a whole new plan.